Crucible.



PATBNTED JAN. 8, 1907.

y No. 840,825.1 v

B. A-..ooLBY.

'0RU0IBLE- APPIfIGAT'ION FILED NOV.. 23. 1905. RENEWED 00T.`9, 1906.

' INVENTOR CPM a, @w57 WLTNESSES:

f. I ATTORNEY from a primary circuit in suitable proximity.

citizen of the United States, residing at Newvof the crucible ,in annular form, provided `fractory material molded into annular form UNITED'` sTATEs, PATENT oEEIoE.

EDWARD A. con-snor NEWARK, NEW JERSEY.

CRUCIBLE.

Speccation of Letters Patent.

Patented Jan. 8, 1907.

Aimiicauon nea November 23,19o51innewed october 9,1906. serial No. 338,169.

To allA whom, it may concern: v

Be it known thatI, EDWARD A. CoLBY, a

ark, in the county of Essex and State of New Jersey, have invented a certain new and useful Improvement in Crucibles, ofr which the following is a specification. .L

The invention relates to a erucible for use in an 'electrical induction-furnace wherein the charge in said crucible is melted by currents induced therein as a secondary circuit The invention consists inthe construction v United States Letters atent No.428,378 f4 granted to me May 2.0, 1890, or it may itself surround said coil.

The metal charge' is placed in the chamber B.

' The recess A niay be used to receive a body of heat-,insulating material, such as magnesia and asbestos or the like, to reduce the heat radiated from the Crucible to its suport, or it may be employed to receive an inucing-coil, which is thus brought near to the charge inthe crucible 'and is also protected b may be ef't empty, the contained air then ,serving as the heat-insulating means.

I claim- 1. A crucible of refractory material in annular form having an annular recess in its under side.

2.- `A crucible of refractory material in annular form having one wall thinner than the .other and an annular recess in its un`der side.

In testimony whereof I have affixed my signature in presence of two witnesses.

` EDWARD A. COLBY. Witnesses:

PARK BENJAMImJr., WM. H. SIEGMAN.

the crucible-walls,or the recess l 

